1 /* 2 * libjingle 3 * Copyright 2004--2010, Google Inc. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright notice, 9 * this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright notice, 11 * this list of conditions and the following disclaimer in the documentation 12 * and/or other materials provided with the distribution. 13 * 3. The name of the author may not be used to endorse or promote products 14 * derived from this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO 19 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include "webrtc/modules/audio_device/linux/latebindingsymboltable_linux.h" 29 30 #ifdef WEBRTC_LINUX 31 #include <dlfcn.h> 32 #endif 33 34 // TODO(grunell): Either put inside webrtc namespace or use webrtc:: instead. 35 using namespace webrtc; 36 37 namespace webrtc_adm_linux { 38 39 inline static const char *GetDllError() { 40 #ifdef WEBRTC_LINUX 41 char *err = dlerror(); 42 if (err) { 43 return err; 44 } else { 45 return "No error"; 46 } 47 #else 48 #error Not implemented 49 #endif 50 } 51 52 DllHandle InternalLoadDll(const char dll_name[]) { 53 #ifdef WEBRTC_LINUX 54 DllHandle handle = dlopen(dll_name, RTLD_NOW); 55 #else 56 #error Not implemented 57 #endif 58 if (handle == kInvalidDllHandle) { 59 WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, -1, 60 "Can't load %s : %s", dll_name, GetDllError()); 61 } 62 return handle; 63 } 64 65 void InternalUnloadDll(DllHandle handle) { 66 #ifdef WEBRTC_LINUX 67 // TODO(pbos): Remove this dlclose() exclusion when leaks and suppressions from 68 // here are gone (or AddressSanitizer can display them properly). 69 // 70 // Skip dlclose() on AddressSanitizer as leaks including this module in the 71 // stack trace gets displayed as <unknown module> instead of the actual library 72 // -> it can not be suppressed. 73 // https://code.google.com/p/address-sanitizer/issues/detail?id=89 74 #if !defined(ADDRESS_SANITIZER) 75 if (dlclose(handle) != 0) { 76 WEBRTC_TRACE(kTraceError, kTraceAudioDevice, -1, 77 "%s", GetDllError()); 78 } 79 #endif // !defined(ADDRESS_SANITIZER) 80 #else 81 #error Not implemented 82 #endif 83 } 84 85 static bool LoadSymbol(DllHandle handle, 86 const char *symbol_name, 87 void **symbol) { 88 #ifdef WEBRTC_LINUX 89 *symbol = dlsym(handle, symbol_name); 90 char *err = dlerror(); 91 if (err) { 92 WEBRTC_TRACE(kTraceError, kTraceAudioDevice, -1, 93 "Error loading symbol %s : %d", symbol_name, err); 94 return false; 95 } else if (!*symbol) { 96 WEBRTC_TRACE(kTraceError, kTraceAudioDevice, -1, 97 "Symbol %s is NULL", symbol_name); 98 return false; 99 } 100 return true; 101 #else 102 #error Not implemented 103 #endif 104 } 105 106 // This routine MUST assign SOME value for every symbol, even if that value is 107 // NULL, or else some symbols may be left with uninitialized data that the 108 // caller may later interpret as a valid address. 109 bool InternalLoadSymbols(DllHandle handle, 110 int num_symbols, 111 const char *const symbol_names[], 112 void *symbols[]) { 113 #ifdef WEBRTC_LINUX 114 // Clear any old errors. 115 dlerror(); 116 #endif 117 for (int i = 0; i < num_symbols; ++i) { 118 if (!LoadSymbol(handle, symbol_names[i], &symbols[i])) { 119 return false; 120 } 121 } 122 return true; 123 } 124 125 } // namespace webrtc_adm_linux 126